AntennaTracker: added sending on SIMSTATE in SITL
autotest: raise turn rate of antennas
autotest: kill off old tasks on exit
Rover: fixed comment
Plane: print PX4 compass type
AP_Compass: fixed showing of is_external for 2nd compass
AP_NavEKF : Update comments and remove un-used function declarations
AP_NavEKF : Use synthetic sideslip fusion during GPS denied operation with airspeed
AP_NavEKF : Prevent bad user parameter causing incorrect GPS fusion
AP_NavEKF : Update default tuning parameters (for plane use)
AP_GPS: removed nav_setting default

not needed, and apparently caused issue with xcode 5.1